STAFFORD, ENGLAND  [Wednesday Aug.22.2007]  /Mix103FM.com/ -- Dave Grohl's mother joined the Foo Fighters onstage during their perfomance at the UK's V Festival over the weekend.

Grohl told the crowd, "A lot of people here tonight are important to me. But there is one person that is more important than any of you motherf**kers. Virginia Hammond Grohl everybody."

Mama Grohl stayed onstage while the band played "Up In Arms," reports teenmusic.com.

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